1*0b57cec5SDimitry Andric //===-- divti3.c - Implement __divti3 -------------------------------------===// 2*0b57cec5SDimitry Andric // 3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*0b57cec5SDimitry Andric // 7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 8*0b57cec5SDimitry Andric // 9*0b57cec5SDimitry Andric // This file implements __divti3 for the compiler_rt library. 10*0b57cec5SDimitry Andric // 11*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 12*0b57cec5SDimitry Andric 13*0b57cec5SDimitry Andric #include "int_lib.h" 14*0b57cec5SDimitry Andric 15*0b57cec5SDimitry Andric #ifdef CRT_HAS_128BIT 16*0b57cec5SDimitry Andric 17*0b57cec5SDimitry Andric // Returns: a / b 18*0b57cec5SDimitry Andric 19*0b57cec5SDimitry Andric COMPILER_RT_ABI ti_int __divti3(ti_int a, ti_int b) { 20*0b57cec5SDimitry Andric const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1; 21*0b57cec5SDimitry Andric ti_int s_a = a >> bits_in_tword_m1; // s_a = a < 0 ? -1 : 0 22*0b57cec5SDimitry Andric ti_int s_b = b >> bits_in_tword_m1; // s_b = b < 0 ? -1 : 0 23*0b57cec5SDimitry Andric a = (a ^ s_a) - s_a; // negate if s_a == -1 24*0b57cec5SDimitry Andric b = (b ^ s_b) - s_b; // negate if s_b == -1 25*0b57cec5SDimitry Andric s_a ^= s_b; // sign of quotient 26*0b57cec5SDimitry Andric return (__udivmodti4(a, b, (tu_int *)0) ^ s_a) - s_a; // negate if s_a == -1 27*0b57cec5SDimitry Andric } 28*0b57cec5SDimitry Andric 29*0b57cec5SDimitry Andric #endif // CRT_HAS_128BIT 30